|
. . that with the closure of my local Quality Farm and Fleet, I went shopping for bargains and one of the bargains I got was several pails of the original-style 90-weight fluid "for older Ford tractors." In the linked dissertation, there is some discussion of what API grade oil is that is sold under this generic designation. The original Ford spec called for "straight mineral oil", which would correspond to the present-day designation of GL1. Later Ford specs called for a "mild EP" oil, which would correspond to the present-day designation of GL3. The concern is that the presence of additives to increase performance at high contact pressures (typically compounds of sulfur and phosphorus) may eat up some of the bronze bushings used in the N transmission. This may be especially an issue in the 9N/2N (three-speed) transmission, which was designed and specified before gear oil with significant additives became commonly used. The oil which I bought on sale was Farm King brand, it was specifically labelled "for use in older Ford tractors", and because I bought a bunch of it, I got the manufacturer's overpack with it, and this specifically lists this oil as being of API grade GL1. A quick sniff tells that it does have some level of sulfur additives, but if it meets that designation, the level must be low enough that it doesn't even make API grade GL2. My guess would be that that is not enough to worry about. Hope this clarifies. llater, llamas
|
